Herbs annual, subglabrous, monoecious. Stems erect, simple or branched, 5-50 cm tall, succulent. Stipules soon deciduous, ovate-oblong, 2-3 mm, membranous; petiole subequal in length, 0.4-4.5 cm, sparsely puberulent adaxially; leaf blade spreading, rhombic-ovate or broadly ovate, subequal in size, 1-9 × 0.6-5 cm, membranous, 3-veined, lateral veins several, distal ones anastomosing, others inconspicuous, both surfaces sparsely pilose, cystoliths linear, base often broadly cuneate, or proximal ones obtuse, margin dentate-serrate, apex shortly acuminate, caudate, or acute; proximal leaf pair often entire. Inflorescences often androgynous, solitary, from almost every node, male a scorpioid cyme, shorter, in the lower nodes, subsessile, many flowered; female inflorescence larger, in upper nodes, in fruit enlarged, but often shorter than petioles. Male flower pedicellate or sessile, in bud obovoid, ca. 1.8 mm; perianth lobes 2(-4), cymbiform, connate at base, subapically corniculate; stamens 2(-4); rudimentary ovary inconspicuous. Female perianth lobes free, subequal or lateral ones slightly larger, all oblong-cymbiform, as long as achene in fruit. Achene often with brownish dots, triangular-ovoid, 1.2-1.8 mm, compressed, smooth. Fl. Jun-Aug, fr. Aug-Nov.
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Annual, very smooth and pellucid, 1–5 dm; lvs long-petioled, shining, ovate, 3–12 cm, serrate or crenate-serrate, broadly cuneate to rounded at base, usually glabrous, 3-nerved from the base, the nerves narrowly winged; terminal lf-tooth elongate; cymes 5–30 mm from the middle and upper axils; cal-lobes equal or nearly so; achenes pale green, usually with slightly raised purple spots, 1.3–2 mm, 55–70% as wide as long; seed smooth. Moist, rich, shaded soil, often in colonies; Que. to Minn., s. to Fla., La., and Okla. July–Sept. (Adicea p.) Northeastern plants have the lvs sharply cuneate at base, with 11 or fewer rounded teeth on each side. Toward the s. and w. the lf-base tends to be more rounded, and the teeth sharper and more numerous; this poorly defined phase has been called var. deamii (Lunell) Fernald.
Herbs , 0.7-7 dm. Stems simple, erect. Leaf blades elliptic to broadly elliptic or ovate, paired blades equal, 2-13 × 1-9 cm, margins dentate. Inflorescences crowded to lax. Flowers ca. 1 mm across. Achenes uniformly light colored or with streaks of purple, compressed, teardrop-shaped, 1.3-1.7 × 0.6-1.1 mm, smooth or purple striations sometimes raised. 2 n = 24, 26.
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